Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




1277 posts

Uber Geek
+1 received by user: 22


Topic # 57620 19-Feb-2010 10:57
Send private message

My laptop does not have a line-in, just mic and headphone. Is there any way I can feed from line out on my audio device to the mic in? Im guesssing the levels will be different and may need some sort of attentuation adjustment ?

Create new topic
261 posts

Ultimate Geek


  Reply # 300323 19-Feb-2010 11:10
Send private message

What are you trying to acheive?

I do home recording (drums, keys, bass, guitair, vocals etc) so can help out if you are trying to do something like that.

What is the audio device the audio is coming from? What outputs does it have? What do you want to do with the recorded audio?

As a general rule, the mic input on your PC will only be good for voice chat quality recording. I won't use it to record a pod cast or anything.



1277 posts

Uber Geek
+1 received by user: 22


  Reply # 300326 19-Feb-2010 11:18
Send private message

I am in the process of converting my home vhs movies to dvd using a usb video convertor. My previous laptop had line-in as well as mic and headphone but this newer? one is missing the line-in. The video convertor has a 3.5m stereo audio plug. I tried this in the headphone socket on the laptop but audio quality was terrible.
Thanks for your advice :-)

 
 
 
 


261 posts

Ultimate Geek


  Reply # 300329 19-Feb-2010 11:27
Send private message

Best bet is some sort of audio interface.

You'd probably want one with RCA inputs (from memory, this is what the VCRs output audio with)

Cheapest are around 100 bucks (for studios, they run into the thousands).

I can't attest to the quaility of these. I am not affliated with these traders.
http://www.trademe.co.nz/Music-instruments/PA-pro-audio-DJ-equipment/Computer-recording/auction-2724...

http://www.trademe.co.nz/Music-instruments/PA-pro-audio-DJ-equipment/Computer-recording/auction-2721...

1748 posts

Uber Geek
+1 received by user: 361

Trusted

  Reply # 300929 22-Feb-2010 10:50
Send private message

A quick google on the soundblaster card shows: ( and would be indicative of most mic / line inputs)

Microphone Impedance: 600 Ohms
Line-In Impedance: 47 KOhms
CD Audio-In Impedance: 50 KOhms



Microphone Sensitivity: 10 - 200 mVpp
Line-In Sensitivity: 0 - 2 Vpp
CD Audio-In Sensitivity: 0 - 2 Vpp


As you can see, the mic input is way more sensitive than the standard line input.
What you need is a 10:1 L-Pad attenuator - this will normalise the output from the USB converter to a level that the mic input can handle. I made one up recently using 10K and 1K resistors ( i think - can't remember the specifics ) to do more or less the same thing - line levels to mic levels for a tape recorder. Then there was soldering it all up to a 3.5mm socket and plugs, and bunging into a small case - time intensive for $6 worth of parts.




My thoughts are no longer my own and is probably representative of our media-controlled government




1277 posts

Uber Geek
+1 received by user: 22


  Reply # 300931 22-Feb-2010 10:57
Send private message

Thanks for that, will give it a go.



1277 posts

Uber Geek
+1 received by user: 22


  Reply # 300940 22-Feb-2010 11:16
Send private message

Just looking at that again, wouldnt it be a 100:1 so 10k andd 100r ?

1748 posts

Uber Geek
+1 received by user: 361

Trusted

  Reply # 300947 22-Feb-2010 11:48
Send private message

Yeah - I was guessing :-)
See here: ( I used the 40dB attenuator)
http://www.epanorama.net/circuits/line_to_mic.html

I did make a point to point solder effort and no case, and ecch, bloody unreliable with constant insertions/extractions. Do make the effort and build it in a case, or at least have the two jacks mounted on something like an aluminum u-channel or L-girder shaped bracket and solder the resistors to the jack tag leads.




My thoughts are no longer my own and is probably representative of our media-controlled government


21613 posts

Uber Geek
+1 received by user: 4430

Trusted
Subscriber

  Reply # 301050 22-Feb-2010 16:37
Send private message

Can you not retask the jack can on my stinkpad at least. Only allows for mic or line in.

Shouldnt the USB device have audio in as well? Does on the cheap nasty easycap I got. Lousy video on it however.




Richard rich.ms

1748 posts

Uber Geek
+1 received by user: 361

Trusted

  Reply # 301065 22-Feb-2010 16:58
Send private message

richms: Can you not retask the jack can on my stinkpad at least. Only allows for mic or line in.


Shouldnt the USB device have audio in as well? Does on the cheap nasty easycap I got. Lousy video on it however.


Where would you find the setting to choose inputs ? Had a quick squizz thru my HP Laptop Control Panel - Sound and Audio settings ..

A couple of ideas for the original poster:

1) How about a docking station for the laptop - usually they allow more functionality and I/O ports that the standard laptop.

2) And as Richms said, I doubt the quality of the conversion would be up to par. For $40.00 RETAIL, would mean that it cost less than $5.00 to make - you can't get decent A/D conversion at that price ;-).

For VCR to DVD conversion, I use a DVD recorder based DVR - and record at SQ mode  - 4 hours per DVD-RW disk. You can go to HQ (High Quality) mode, but that would be pointless.

Then import the DVD into your favourite DVD authoring tool. Saves faffing about with unknown software drivers, device conflicts, and stutters due to other PC activity.

Old school maybe, and involves 2 steps, but means I don't have to lug the VCR to the PC, mess around with cables at the back of the PC, and the assorted spiders and bugs around the back taking offense at me disturbing their carefully crafted dust hideouts :-)




My thoughts are no longer my own and is probably representative of our media-controlled government


21613 posts

Uber Geek
+1 received by user: 4430

Trusted
Subscriber

  Reply # 301144 22-Feb-2010 18:46
Send private message

I cant recall exactly where it was, one of the many unneeded apps that they ship with it would let you choose.

Same as a desktop computer lets you change the jack tasks thru the realtek tray app, unless you are unlucky enough to own an asus board.

I have had sync issues when trying to get audio and video from different devices to work together. When I last had to get stuff off VHS tapes the only reliable way I found was to use my DV camera to digitize it and send it thru firewire to the computer. Using the soundcard ended up with a file about 30 seconds too short.




Richard rich.ms



1277 posts

Uber Geek
+1 received by user: 22


  Reply # 301204 22-Feb-2010 20:29
Send private message

Hmm, its just a one-off so dont want to get too involved. 2 resistors at 5c each sounds good :-)



1277 posts

Uber Geek
+1 received by user: 22


  Reply # 301205 22-Feb-2010 20:31
Send private message

Having said that, being able to tweak the input to get the same result would be good, running win7 and dont see how tho.

Create new topic



Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.


Geekzone Live »

Our community of supporters help make Geekzone possible. Click the button below to join them.

Support Geezone on PressPatron



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.